The usual size of lactulose oral solution should be taken once about half an hour before breakfast. For children, the dose needs to be reduced appropriately and can be taken in 2-3 doses a day. Lactulose can be used for the treatment of hyperammonia and some diseases caused by elevated blood ammonia, as well as for the treatment of chronic functional constipation. If the bowel movement is smooth or the frequency increases significantly, the dosage should be reduced and the frequency should be reduced to avoid diarrhea caused by excessive dosage. If constipation does not improve or recurs after 2-3 days of medication, identify the cause and consult a doctor to adjust the medication. During the period of taking Lactulose Oral Liquid, it is recommended to eat a light diet, avoid spicy, greasy and other stimulating foods, drink more water and eat more fresh vegetables and fruits to promote bowel movement.